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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

130920 puzzles downloaded.

13 4   5 3 7   14       1   11    
11     12       10       4        
        13     12 11   2 10   5    
    14         1 3   8   15 13 16  
  2 12   7 1             11     15
7         13       5           9
  13           5   15            
    6   8       2       5 3   7
2   4 10       7       16   9    
            4   6           5  
15           8       12         4
1     6             4 9   15 2  
  8 2 11   15   9 16         6    
    7   16 3   11 14     6        
        4       7       12     13
    9   12       10   3 8 16   15 11
Showing puzzle number: 541
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Super easy (0)
Solution methods: SiSo
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